1
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I can solve all two hundred yards short.

2
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Right now all on targets.

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Long before Pearl Harbor the signal corps
of the United States Army you it would

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take more than a telephone wire to connect
this voice with all the other fighting

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units that had to hear it.

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They knew it would take radio transmission
radio can reach these tanks wherever

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they are

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and tell them what's ahead a radio
transmitter could coordinate the movement of

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00:01:35,57 --> 00:01:41,39
troops bring tanks and infantry to gather
at the right place at the right time.

10
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But it would have to be a
mobile radio transmitter

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and it would have to be a powerful
transmitter to keep an eye on broken contact

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between our forces on
the ground in the air

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and on the sea the control.

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Widely separated forces the timing of
their action the success of the attack.

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Depends upon reliable radio communication.

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Yes the signal caller engineers knew just
what kind of a transmitter it would take

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to do the job

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but the big problem was to locate a
manufactured transmitter of a design

19
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that would come close to these requirements
in this pre-war how the crafters H

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T four transmitter the Signal
Corps found many of the answers.

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It was designed especially for amateur
use it was easily capable of worldwide

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communication using either coast or voice.

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Another great advantage was the fact

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that this how a crafters unit at been
on the market for several years.

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There was an opportunity to check its
performance through the records of hundreds

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00:02:53,94 --> 00:02:54,98
of America's hands

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and these amateurs know good performance
it employed a band switching in the

28
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exciter and driver stages.

29
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Which made it possible to change
frequencies very rapidly.

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Deputy director had reported back to

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return.

32
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I have referred them out in
the car making the person

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right now are

34
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never quite right below say Q

35
00:03:40,68 --> 00:03:46,82
below See Q This is W nine W Z
E Chicago W nine W Z E Chicago

36
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calling C.Q. Alone for any twenty
meter phone I'm standing by.

37
00:03:52,15 --> 00:03:55,04
Go ahead please.

38
00:03:57,59 --> 00:03:59,91
Just a buddy.

39
00:04:00,00 --> 00:04:05,04
Nine W W W W.

40
00:04:05,42 --> 00:04:10,73
This is what we have been all
about is a five W six from

41
00:04:18,84 --> 00:04:22,82
a low W. Six to the Los Angeles
California. There's a W.

42
00:04:22,82 --> 00:04:27,96
Nine W A Z E Chicago coming back but
didn't have their signals to come in

43
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and find the knives are five
S. Nine by the way her.

44
00:04:32,48 --> 00:04:36,14
What are you doing on twenty meter
phone about two hours worth C.W.

45
00:04:37,61 --> 00:04:41,99
Knowledge is something about the
marvelous California weather.

46
00:04:42,00 --> 00:04:46,02
Alaska Australia Europe South Africa.

47
00:04:46,86 --> 00:04:51,96
These were regular almost daily
experiences in many amateurs homes where

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00:04:51,96 --> 00:04:55,08
Hallicrafters were rapidly
shrinking this old world of ours.

49
00:04:57,04 --> 00:05:00,99
The transmitter that served the army
must be able to perform anywhere

50
00:05:00,99 --> 00:05:07,80
and under all kinds of unpredictable
conditions up to this time no one

51
00:05:07,80 --> 00:05:12,14
had ever thought seriously of putting this
sensitive finely balanced instrument on

52
00:05:12,14 --> 00:05:12,60
wheels

53
00:05:12,60 --> 00:05:19,10
and bouncing it around foxholes What about
vibration where with the power to come

54
00:05:19,10 --> 00:05:24,84
from the job of toughening up
the age to four to go to war.

55
00:05:25,10 --> 00:05:30,46
Well on the shoulders of Bill Halligan Bob
Samuelson how to crafters chief engineer

56
00:05:30,46 --> 00:05:37,43
and the hard pressed technicians of the
Signal Corps Never few changes needed to

57
00:05:37,43 --> 00:05:38,92
adapt this unit to Army needs.

58
00:05:39,31 --> 00:05:44,24
There was good engineering and good sound
instruction in the set to start with.

59
00:05:46,49 --> 00:05:49,66
This was to be the new home
for Hallicrafters equipment.

60
00:05:50,11 --> 00:05:52,08
Everything needed to transmit

61
00:05:52,08 --> 00:05:55,30
and receive had to be packed
into this small space

62
00:05:56,10 --> 00:05:58,43
that would take some
more good engineering.

63
00:06:02,69 --> 00:06:05,67
This demand was nothing
new to these pioneers.

64
00:06:06,09 --> 00:06:11,06
There are no fixed limits in
Hallicrafters design or construction.

65
00:06:11,18 --> 00:06:16,37
There is always development
change improvements.

66
00:06:16,39 --> 00:06:21,36
Many of the war adaptations were
drawn from advanced developments

67
00:06:21,36 --> 00:06:25,85
that had been in the
experimental stage for months.

68
00:06:26,95 --> 00:06:31,80
For example in the pre-war model
plugging in a tuning unit might be quite

69
00:06:31,80 --> 00:06:38,78
attractive the holes in the
Proms couldn't get together.

70
00:06:42,24 --> 00:06:47,28
Or the new signal core transmitter guide
channels made this tuning unit change

71
00:06:47,28 --> 00:06:48,45
quick positive

72
00:06:48,45 --> 00:06:55,42
and how the unit securely in place
in the pre-war model the Proms

73
00:06:55,42 --> 00:06:57,74
on the tube were enough
to hold it in place.

74
00:06:58,33 --> 00:07:02,68
But this won't do the hopping shell holes.

75
00:07:02,70 --> 00:07:06,95
The tubes support or a ring
was added to lock that too.

76
00:07:07,13 --> 00:07:12,24
Firmly in position so that no amount
of bumping or vibration would move it.

77
00:07:15,08 --> 00:07:19,65
For stationary use no special footing
was needed to anchor the transmitter.

78
00:07:20,45 --> 00:07:25,97
But for rough riding in a truck rubber
shockproof mountings were added.

79
00:07:26,84 --> 00:07:32,53
In the process of making the entire unit
more rugged this air patter was replaced

80
00:07:32,53 --> 00:07:39,44
by a new vacuum tube padding condenser
rooftop antennas could be as

81
00:07:39,44 --> 00:07:43,65
large as the pre-war Ham wanted to
make them but it was pretty obvious

82
00:07:43,65 --> 00:07:48,91
that a regular such as this one would hardly
do on the top of a signal corps truck.

83
00:07:50,38 --> 00:07:52,74
The solution was in the
use of whip antennas

84
00:07:52,74 --> 00:07:57,74
and in designing an antenna tuning unit
which would have vision play transfer the

85
00:07:57,74 --> 00:07:59,95
output of the transmitter to the weapon.

86
00:08:00,00 --> 00:08:00,17
And

87
00:08:11,51 --> 00:08:16,20
throughout all of these changes to adapt
a peacetime transmitter to wartime

88
00:08:16,20 --> 00:08:16,87
requirements.

89
00:08:17,20 --> 00:08:22,69
The high quality standards of Hallicrafters
were strictly maintained in workmanship

90
00:08:23,39 --> 00:08:29,05
in design and construction and
especially in performance.

91
00:08:30,28 --> 00:08:34,53
When the signal corps inspected the first
of Hallicrafters transmitters armored for

92
00:08:34,53 --> 00:08:39,32
war they found what they were
looking for a high powered unit

93
00:08:39,32 --> 00:08:42,39
that had been made completely mobile one

94
00:08:42,40 --> 00:08:47,78
that delivered good reliable
performance under all conditions.

95
00:08:47,80 --> 00:08:50,05
The first big job had been done.

96
00:08:50,11 --> 00:08:55,17
Well then came the warning
of another bigger job.

97
00:08:55,18 --> 00:08:58,72
Field reports indicate
performance of S.C.R.

98
00:08:58,72 --> 00:09:05,45
To ninety nine accedes expectation
requests to expedite production as

99
00:09:05,45 --> 00:09:09,62
much as possible and in
working man's English

100
00:09:09,62 --> 00:09:15,30
that means let's go on production.

101
00:09:15,32 --> 00:09:20,40
This is the plant in clearing Illinois
where mass production of the new S.C.R.

102
00:09:20,40 --> 00:09:26,11
To ninety nine mobile radio station was
obtained on a scale never dreamed of before

103
00:09:26,11 --> 00:09:28,89
in this industry.

104
00:09:28,90 --> 00:09:33,49
The key man for this tremendous production
jobs were selected from the ranks of the

105
00:09:33,49 --> 00:09:36,81
American radio amateurs.

106
00:09:36,83 --> 00:09:40,01
These men had to know how
the technical background

107
00:09:40,01 --> 00:09:46,48
and experience it took to get into action
fast this entire operation is headed by

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00:09:46,48 --> 00:09:51,64
Herb Hartley known to the amateur
fraternity as W Niamh W N G

109
00:09:53,49 --> 00:09:57,31
This production was accomplished through
the splendid cooperation of hundreds of

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00:09:57,31 --> 00:09:59,87
loyal skilled workers the real.

111
00:10:00,00 --> 00:10:03,80
Ised how big the job ahead
was and knew how to do it.

112
00:10:06,91 --> 00:10:09,69
It was achieved through the
unveiling efforts of many suppliers

113
00:10:09,69 --> 00:10:15,18
and their thousands of workers who built
the tubes the Transformers the condensers

114
00:10:15,18 --> 00:10:20,34
coils insulators the steel Jacey's
and all the other components

115
00:10:20,34 --> 00:10:24,53
that go into make the S
C R two ninety nine.

116
00:10:25,37 --> 00:10:27,51
And finally the very design

117
00:10:27,51 --> 00:10:32,58
and construction of the transmitter LED
itself to mass production better than any

118
00:10:32,58 --> 00:10:37,86
other pre-war domestic transmitter.
This chassis was strong.

119
00:10:38,13 --> 00:10:40,78
There was room to work with subassemblies.

120
00:10:43,12 --> 00:10:47,55
This is the main assembly line from
the end of which come the completed

121
00:10:47,55 --> 00:10:53,16
transmitters. This is the feeder
table for the main assembly line.

122
00:10:53,65 --> 00:10:55,75
Here the subassemblies are inspected

123
00:10:55,75 --> 00:11:01,62
or hooked up to other components at the
foot of the main assembly line the

124
00:11:01,62 --> 00:11:02,92
transmitter looks like this.

125
00:11:03,38 --> 00:11:10,02
Steel base to which are added sockets for
rectifier tube then the bleeder resistor

126
00:11:10,02 --> 00:11:14,12
which furnishes a constant load
on the high voltage supply.

127
00:11:14,14 --> 00:11:15,66
Next the filter choke

128
00:11:15,66 --> 00:11:20,32
and condensers which supply direct current
to the plate circuits of the transmitter

129
00:11:21,58 --> 00:11:24,33
in wiring these parts a great deal of time

130
00:11:24,33 --> 00:11:29,21
and work is saved by the
use of pre-formed cables.

131
00:11:29,22 --> 00:11:31,79
The cables are cut formed

132
00:11:31,80 --> 00:11:36,24
and tipped already for installation.

133
00:11:36,25 --> 00:11:41,58
And here's the basis Embley completed in
just a little more time than it's taken to

134
00:11:41,58 --> 00:11:42,01
show it.

135
00:11:45,40 --> 00:11:49,71
Meanwhile on the opposite side of the
table the power control panel is being

136
00:11:49,71 --> 00:11:55,50
assembled. These are the controls for
filament voltage and modulator bias.

137
00:11:55,52 --> 00:11:59,62
The purpose of this panel is to group
within convenient reach of the operator.

138
00:12:00,00 --> 00:12:05,34
All of the essential power controls
these cables here are cut to length

139
00:12:05,34 --> 00:12:12,27
and form over on the feeder table
terminal lugs are soldered to the NS then

140
00:12:12,28 --> 00:12:16,90
all the other wires needed in the circuit
are placed into position bound together

141
00:12:18,01 --> 00:12:22,08
so that soldering to terminals is the only
operation needed in the final assembly.

142
00:12:23,65 --> 00:12:26,68
This is a power panel cable.

143
00:12:26,70 --> 00:12:29,51
When wiring is completed and the switches

144
00:12:29,51 --> 00:12:34,19
and fuses have been installed the sides
are joined to the power control panel

145
00:12:34,19 --> 00:12:39,70
and this unit is ready to
join the main assembly line.

146
00:12:39,72 --> 00:12:44,95
The transmitter begins to take shape as the
base is joined to the power panel unit

147
00:12:45,71 --> 00:12:49,75
electric oyster used for ease and
accuracy and handling these parts.

148
00:12:52,76 --> 00:12:55,00
Now the main power
transformer is set in place.

149
00:12:56,27 --> 00:12:57,03
This is the unit

150
00:12:57,03 --> 00:13:01,46
that steps up the inputs to the high
voltage required to operate the final

151
00:13:01,46 --> 00:13:05,04
amplifier and modulator two.

152
00:13:05,06 --> 00:13:08,79
After the transformer is
connected the entire deck

153
00:13:08,79 --> 00:13:12,41
or base is forced into a dolly
to make handling easier.

154
00:13:13,65 --> 00:13:16,60
There is high power equipment
on this deck and it's heavy.

155
00:13:18,86 --> 00:13:21,66
The second deck contains
the audio driver stage

156
00:13:21,66 --> 00:13:27,53
and modulator of the transmitter which
makes possible radio telephone operation.

157
00:13:27,55 --> 00:13:34,39
Listen tire unit built in another plant
has been inspected on the feeder tables.

158
00:13:34,40 --> 00:13:40,50
And requires only a modulation transformer
and a phone C.W. Relay to be complete.

159
00:13:44,25 --> 00:13:48,81
The top deck of the transmitter the
radio frequency section begins with the

160
00:13:48,81 --> 00:13:53,48
installation of the cipher assembly which
is fabricated at how the crafters twenty

161
00:13:53,48 --> 00:13:58,80
six st plants three separate tuning
units may be plugged into this assembly

162
00:13:59,57 --> 00:14:02,24
and you want of which may be
selected by the band switch.